CN2899731Y - Detector for tooth root canal length - Google Patents
Detector for tooth root canal length Download PDFInfo
- Publication number
- CN2899731Y CN2899731Y CN 200620102675 CN200620102675U CN2899731Y CN 2899731 Y CN2899731 Y CN 2899731Y CN 200620102675 CN200620102675 CN 200620102675 CN 200620102675 U CN200620102675 U CN 200620102675U CN 2899731 Y CN2899731 Y CN 2899731Y
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- circuit
- resistance
- root canal
- canal length
- switch
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Abstract
The utility model relates to a teeth root canal length tester, which comprises an power source, a signal collection circuit, a signal treatment circuit and a display, wherein, the signal collection circuit is composed of a reference electrode and a detection electrode between which a human body resistance is formed; the signal treatment circuit is provided with a benchmark resistance to judge the differences between the human body resistance and the benchmark resistance and calculate the distance between the terminal part of the detection electrode and the apical foramen of tooth; the signal treatment circuit is connected with a switching switch, and one way of the switch is directly connected with the signal collection circuit and the other way of the switch is connected with the signal collection circuit through a self-checking circuit whose equivalent resistance is equal to the benchmark resistance. A self-checking circuit is arranged in the tester so as to immediately find defects of the signal collection circuit and to ensure the measuring accuracy, so the utility model has a great practical value.
Description
(1) technical field
This utility model relates to a kind of root canal length measuring instrument.
(2) background technology
Root canal length measuring instrument is used for the mensuration of root canal length, to guarantee that the doctor holds sono-explorer accurately in root canal, improves the success rate of root canal.
The principle of sono-explorer electronic gauge is based on the scientific achievement in advance of Suzuki (1942) and Sunada (1962).1958, resistance value was constant between Japanese scholar Sunada application unidirectional current test finder's periodontal membrane and the oral mucosa, about 6.5k Ω.On this basis, resistor-type apical foramen of tooth analyzer is manufactured to come out and introduces to the market.6.5K the numerical value of Ω is set at the electronic circuit of root canal measurement.One end of root canal measurement is to link to each other with oral mucosa by the lip folder, and the other end links to each other with root-canal broach (file).When root-canal broach enters into the root pipe, and approach apical foramen of tooth, touch the periodontal tissue at apical foramen of tooth place up to its tip, this circuit has promptly formed the loop.The resistance of root canal measurement is when resistance between the sharp oral cavity mucosa of root-canal broach (file) reaches consistent now, and instrument shows that root-canal broach has reached apical foramen of tooth.Above-mentioned sono-explorer electronic gauge can only be judged the terminal point of root-canal broach, but can't draw the length of root pipe in real time.Relevant patent documentation has CN86108611 etc.
The current stomatology paper of delivering has comprised a large amount of relevant this kind of the raising accuracy of instruments and the content of endodontic treatment equipment.The root marrow is dry more, and most apparatus measures results are more accurate.But in the middle of practical operation, people normally to a humidity, that have vital pulp, with hemorrhage, secretions arranged or measure with the root pipe that sodium hypochlorite washed.These materials have just become electric conductor, have caused circuit to produce inaccurate reaction.Therefore, the measurement result under this environment is inaccurate.
The root canal length measuring instrument of the latest generation of current development, comprise power supply, signal acquisition module, signal processing module, display, signal acquisition circuit is made up of reference electrode and exploring electrode, form human body resistance between reference electrode and the exploring electrode, reference electrode adopts the oral cavity hook usually, exploring electrode adopts reamer usually, and signal acquisition circuit connects signal processing circuit; Described signal processing circuit is provided with reference resistance, and signal processing circuit is judged the difference of human body resistance and reference resistance, and calculates the distance between exploring electrode end and the apical foramen of tooth.Based on electrolytical electrical conductivity in the root pipe is certain value under given conditions, can calculate distance between root-canal broach and the apical foramen of tooth by the difference of human body resistance and reference resistance.That this root canal measurement can be used to measure is moist, that have pulp tissue, with root pipe hemorrhage, that secretions is arranged or washed with sodium hypochlorite.But in the practical operation, signal acquisition circuit is exposed in the atmosphere, can produce the aging of components and parts and each contact unavoidably, causes the variation (change the zero point of measurement) of reference resistance indirectly, and the sono-explorer that records thus can be inaccurate.
(3) utility model content
This utility model purpose is to provide a kind of can judge the signal acquisition circuit duty automatically, and the root canal length measuring instrument of in time reporting to the police.
Root canal length measuring instrument described in the utility model, comprise power supply, signal acquisition circuit, signal processing circuit, display, described signal acquisition circuit is made up of reference electrode and exploring electrode, forms human body resistance between described reference electrode and the exploring electrode; Described signal processing circuit is provided with reference resistance, and signal processing circuit is judged the difference of human body resistance and reference resistance, and calculates the distance between exploring electrode end and the apical foramen of tooth;
Described signal processing circuit connects change-over switch, and a road of switch directly is connected with signal acquisition circuit, and another road of switch is connected with signal acquisition circuit through self-checking circuit, and the equivalent resistance of described self-checking circuit equals reference resistance.
Further, described self-checking circuit is made up of placed in-line resistance and electric capacity.
Further, described switch is a gate-controlled switch.
Further, described signal processing circuit also is connected with acoustical generator.
Described reference electrode is generally the oral cavity hook.
Described exploring electrode is generally reamer.
During root canal length measuring instrument self check described in the utility model, switch is switched to the connection self-checking circuit, with reference electrode and exploring electrode short circuit, self-checking circuit was connected with signal acquisition circuit and was formed closed circuit this moment, this closed circuit should equal reference resistance at the equivalent resistance that signal acquisition circuit conducts electricity when good, and when signal acquisition circuit electric conductivity decline occurs because of wearing out, the equivalent resistance of this closed circuit can be greater than reference resistance, when difference exceeded the scope of permission, signal processing circuit was reported to the police.Generally need to change the signal acquisition circuit components and parts this moment.
This utility model makes that by self-checking circuit is set the defective in the signal acquisition circuit can in time be found in analyzer, the accuracy in having guaranteed to measure has great practical value.
(4) description of drawings
Fig. 1 is the circuit diagram of embodiment 1 described self-checking circuit.
(5) specific embodiment
The utility model is described in further detail below in conjunction with embodiment, but protection domain of the present utility model is not limited to this.
With reference to Fig. 1, a kind of root canal length measuring instrument comprises power supply, signal acquisition circuit, signal processing circuit, display, and signal acquisition circuit is made up of reference electrode and exploring electrode, form human body resistance between reference electrode and the exploring electrode, signal acquisition circuit connects signal processing circuit; Signal processing circuit is provided with reference resistance, and signal processing circuit is judged the difference of human body resistance and reference resistance, and calculates the distance between exploring electrode end and the apical foramen of tooth;
Signal processing circuit connects gate-controlled switch K, and a road of switch directly is connected with signal acquisition circuit, and another road of switch is connected with signaling interface J through self-checking circuit, and the equivalent resistance of self-checking circuit equals reference resistance.Self-checking circuit is made up of placed in-line resistance R and capacitor C, and capacitor C connects signaling interface J, and signaling interface J connects signal acquisition circuit.
Signal processing circuit is connected with display and acoustical generator.Reference electrode is selected the oral cavity hook for use, and exploring electrode is selected reamer for use.
During described root canal length measuring instrument self check, gate-controlled switch K is switched to the connection self-checking circuit, with reference electrode and exploring electrode short circuit, self-checking circuit was connected with signal acquisition circuit and was formed closed circuit this moment, this closed circuit should equal reference resistance at the equivalent resistance that signal acquisition circuit conducts electricity when good, and when signal acquisition circuit descends because of electric conductivity appears in component ageing, the equivalent resistance of this closed circuit can be greater than reference resistance, when difference exceeded the scope of permission, signal processing circuit was reported to the police.
When described root canal length measuring instrument is applied to measure, K is switched to signal acquisition circuit with gate-controlled switch, the oral cavity is suspended to human body bicker place, reamer inserts tooth, this moment, signal processing circuit calculated the distance between exploring electrode end and the apical foramen of tooth, and showed in real time on display.
Claims (6)
1, a kind of root canal length measuring instrument comprises power supply, signal acquisition circuit, signal processing circuit, display, and described signal acquisition circuit is made up of reference electrode and exploring electrode, forms human body resistance between described reference electrode and the exploring electrode; Described signal processing circuit is provided with reference resistance, and signal processing circuit is judged the difference of human body resistance and reference resistance, and calculates the distance between exploring electrode end and the apical foramen of tooth;
It is characterized in that: described signal processing circuit connects change-over switch, and a road of switch directly is connected with signal acquisition circuit, and another road of switch is connected with signal acquisition circuit through self-checking circuit, and the equivalent resistance of described self-checking circuit equals reference resistance.
2, root canal length measuring instrument as claimed in claim 1 is characterized in that described self-checking circuit is made up of placed in-line resistance and electric capacity.
3, root canal length measuring instrument as claimed in claim 2 is characterized in that described switch is a gate-controlled switch.
4,, it is characterized in that described signal processing circuit also is connected with acoustical generator as the described root canal length measuring instrument of one of claim 1～3.
5, root canal length measuring instrument as claimed in claim 4 is characterized in that described reference electrode is the oral cavity hook.
6, root canal length measuring instrument as claimed in claim 4 is characterized in that described exploring electrode is a reamer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620102675 CN2899731Y (en) | 2006-04-14 | 2006-04-14 | Detector for tooth root canal length |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620102675 CN2899731Y (en) | 2006-04-14 | 2006-04-14 | Detector for tooth root canal length |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2899731Y true CN2899731Y (en) | 2007-05-16 |
Family
ID=38083897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620102675 Expired - Fee Related CN2899731Y (en) | 2006-04-14 | 2006-04-14 | Detector for tooth root canal length |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2899731Y (en) |
-
2006
- 2006-04-14 CN CN 200620102675 patent/CN2899731Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |